Fastener

ABSTRACT

The first fastener comprises a post, a fifth outer boss, an outer slab, a first hole and a second inner flange. The fifth outer boss is provided in an upper portion of the post. The outer slab perpendicular to the post is provided in a lower portion of the post. The first hole is provided within a local region of the outer slab below the post. The second inner flange is provided on an inner wall of the first hole. The second inner flange has a first gap greater than a width of the fifth outer boss. The upper surface of the second inner flange is used for abutting on a lower surface of a fifth outer boss of a second fastener having a same structure as the first fastener when limiting a position of connected pieces in a height direction of the post. Two sections of the second inner flange and two sections of the first gap are provided on the inner wall of the first hole in a staggered manner. Each section of the second inner flange is equivalent to ¼ of a circumference of the inner wall of the first hole. Each section of the first gap is equivalent to ¼ of the circumference of the inner wall of the first hole.

RELATED APPLICATIONS

The present application is a divisional application of U.S. patentapplication Ser. No. 15/731,191 filed Apr. 20, 2017, which claims thebenefit of the Chinese patent applications CN201610248983.X filed Apr.20, 2016 and CN201710207608.5 filed Mar. 31, 2017, each of which isincorporated herein by reference in its entirety.

FIELD OF THE INVENTION

The present invention belongs to the splicing of assembled componentsfor robots. Particularly, the present invention relates to a fastener,and a fastener splicing piece and a fastener connecting member which aresuited with this fastener.

BACKGROUND OF THE INVENTION

With the rapid development of robots, various robots have been developedby the science & technology industries in China and abroad. Thisprovides the necessary material condition for the introduction of robotsin all walks of life, such as at schools. Existing robot members need tobe connected together by means of common connecting members such asscrews and sleeves, and the disassembly is relatively difficult.Moreover, due to their small size, the screws are easy to roll and miss.In addition, tools such as screwdrivers are dangerous for children anddisadvantageous for the popularization, among the children, ofactivities that remarkably improve the manipulative ability and thinkingability, such as building up a robot.

OBJECTS AND SUMMARY OF THE INVENTION

To overcome the technical problems in the prior art, the presentinvention provides a fastener. This fastener directly connects andaxially positions splicing pieces, so the assembly efficiency of a robotis improved.

A fastener is provided, including a post, wherein outer bosses areprovided in an upper portion of the post, with the outer bossesincluding a first outer boss and a second outer boss, the first outerboss being located under the second outer boss, the first outer boss andthe second outer boss being located at different positions in a lengthdirection of the post, and an upper surface of the first outer boss anda lower surface of the second outer boss being used for clamping a firstinner flange on an inner wall of a first through hole of a connectedsplicing piece; and, an outer slab perpendicular to the post is providedin a lower portion of the post, and the outer slab, the first outer bossand the second outer boss are used for limiting the positions of aplurality of the connected splicing pieces along a height direction ofthe post.

By providing a first outer boss and a second outer boss in the upperportion of the post and by clamping a first inner flange of a splicingpiece using the first outer boss and the second outer boss, the relativeaxial position of one splicing piece relative to the fastener may belimited. Moreover, the axial positions of other connected splicingpieces may further be limited by fitting the splicing pieces to an upperplane of the outer slab, so that the axial positions of a plurality ofsplicing pieces on the fastener may be limited without connecting otherlocking components or fasteners on the top of the fastener. Thus, thenumber of pieces to be mounted during connection is reduced, and theassembly efficiency of robots is improved.

Preferably, at least one of the upper surface of the first outer bossand the lower surface of the second outer boss is a slope which forms anacute angle with an axis of the post; and, in a plane of the axis of thepost, the upper surface of the first outer boss and the lower surface ofthe second outer boss form a wedge-shaped gap with a smaller interiorand a larger exterior.

Preferably, a first bump or a first recess is provided on at least oneof the upper surface of the first outer boss and the lower surface ofthe second outer boss, and a second recess or a second bump matched withthe first bump or a third bump matched with the first recess is providedon each of the first inner flange.

Further, preferably, the first outer boss and the second outer boss areoppositely provided in a circumferential direction of the post, and thefirst outer boss and the second outer boss are provided with a firstbump or a first recess facing the other party.

Preferably, first occlusion portions for occluding the first innerflanges are provided on at least one of the first outer boss and thesecond outer boss.

Further, preferably, the first outer boss and the second outer boss areoppositely provided in a circumferential direction of the post, andfirst occlusion portions for occluding the first inner flanges areprovided on a same side of the first outer boss and the second outerboss.

Preferably, the outer bosses further include a third outer boss which isprovided on the top of the post.

Further, preferably, a first hole is formed within a local region of theouter slab under the post, and a second inner flange is provided on aninner wall of the first hole, with the second inner flange having afirst gap greater than the width of the third outer boss, and an uppersurface of the second inner flange being used for abutting to a lowersurface of the third outer boss of the fastener when limiting theposition of the connected splicing piece in the height direction of thepost.

Preferably, an outer flange is provided on a side face of the outerslab.

To overcome the technical problems in the prior art, the presentinvention further provides a splicing piece which can be directlyconnected to a fastener and axially positioned without mounting otherpieces, so that the assembly efficiency is improved.

A splicing piece suited with the fastener is provided, wherein at leastone local portion of the splicing piece is a platy portion, with aconnecting through hole being provided on the platy portion, theconnecting through hole including the first through hole, and an firstinner flange used for clamping the lower surface of the first outer bossand the upper surface of the second outer boss being provided on theinner wall of the first through hole.

By providing a first inner flange in the through hole of the splicingpiece, the splicing piece may be clamped by first and second outerbosses in the upper portion of the post, and the relative axial positionof one splicing piece relative to the fastener may be limited. Moreover,the axial positions of other connected splicing pieces may further belimited by fitting the splicing pieces to an upper plane of the outerslab, so that the axial positions of a plurality of splicing pieces onthe fastener may be limited without connecting other locking componentsor fasteners on the top of the fastener. Thus, the number of pieces tobe mounted during connection is reduced, and the assembly efficiency ofrobots is improved.

Preferably, at least one of the upper surface and lower surface of thefirst inner flange is a slope which forms an acute angle with an axis ofthe post; the upper surface and the lower surface of the first innerflange form a wedge in a plane of the axis of the post; and, the firstinner flange is coordinated with the first outer boss and the secondouter boss to realize radial positioning of the splicing piece and thefastener.

Preferably, a second recess or a second bump matched with the first bumpor a third bump matched with the first recess is provided on the firstinner flange.

Preferably, the connecting through holes further include a secondthrough hole that is an unthreaded hole; an upper positioning flange isprovided on at least one of the upper surface of the outer slab of thefastener and a lower portion of an outer circumferential surface of thepost; and, the upper positioning flange is used for sheathing thefastener on the underneath one of a plurality of splicing pieces on thepost to realize positioning, and the positioning realizes fitting by anouter wall of the upper positioning flange and the inner wall of thesecond through hole of the underneath splicing piece.

Preferably, the splicing piece is a bar member, the connecting throughholes are distributed on a center line of the bar member, and a sidebump protruded from a side wall body is further provided on a side wallof the bar member on an outer side of the second through hole.

To overcome the technical problems in the prior art, the presentinvention provides a fastener connecting member which may connect aplurality of fasteners together.

A fastener connecting member suited with the fastener is provided,wherein the fastener connecting member has a third through hole, and aplurality of third inner flanges used for being clamped by the adjacentouter bosses of the fastener are provided on an inner wall of the thirdthrough hole at different heights.

By providing a plurality of third inner flanges, different inner flangesmay be coordinated with outer bosses of different fasteners to connect aplurality of fasteners together, so that the length of the fasteners isincreased in disguise and more splicing pieces are connected at a sameposition.

Preferably, at least one of the upper surface and lower surface of eachof the third inner flanges is a slope which forms an acute angle with anaxis of the post; the upper surface and the lower surface of each of thethird inner flanges form a wedge in a plane of the axis of the post;and, the third inner flanges are coordinated with adjacent outer bossesto realize radial positioning of the fastener connecting member and thefastener.

Preferably, a second recess or a second bump matched with the first bumpor a fifth bump matched with the first recess is provided on each of thethird inner flange.

To overcome the technical problems in the prior art, the presetinvention further provides an assembled component. The assemblyefficiency of robots is improved if the assembled component is used toassemble robots.

An assembled component is provided, including the fastener and thesplicing piece.

When the splicing piece and the fastener are used, the splicing piecemay be directly connected to the fastener and axially positioned,without mounting other pieces, so that the assembly efficiency of robotsis improved.

Preferably, the assembled component further includes the fastenerconnecting member.

A plurality of fasteners may be connected together, so the length of thefasteners is increased in disguise and more splicing pieces areconnected at a same position.

To overcome the technical problems in the prior art, the presentinvention provides a fastener which can avoid the potential risk of theuse of a screwdriver when robot components are connected by screws inthe prior art.

A fastener is provided, including a post, wherein a fifth outer boss isprovided in an upper portion of the post, and an outer slabperpendicular to the post is provided in a lower portion of the post,with a second inner flange being provided in an inner wall of the firsthole, the second inner flange having a first gap greater than the widthof the fifth outer boss, the upper surface of the second inner flangebeing used for abutting to the lower surface of the fifth outer flangeof the fastener when limiting the position of the connected piece in theheight direction of the post.

When two fasteners are connected together, the post of the lowerfastener extends into a hole of the upper fastener, and the second innerflange of the upper fastener is fastened by the fifth outer flange, sothat the axial positions of two connected pieces are limited and theconnection of the two connected pieces is realized. Moreover, since theouter slab allows the enveloped shape of other pieces to be conical as awhole and the outer bosses will become factors for hindering the rollingof fasteners, the fastener will not be rolled for a long distance, andthe problem of the missing of screws is avoided during the use ofscrews. More crucially, the disassembly/assembly of screws is realizedwithout tools which are possibly dangerous for children, such asscrewdrivers, and the use safety of connecting members for robot piecesis greatly improved.

Preferably, a first recess is provided on the lower surface of the fifthouter boss, and a first bump for being matched with the first recess ofthe lower fastener is provided on the upper surface of the second innerflange.

Or,

a first bump is provided on the lower surface of the fifth outer boss,and a first recess for being matched with the first bump of the lowerfastener is provided on the upper surface of the second inner flange.

Further, preferably, a first lower positioning flange is provided on thelower surface of the outer slab, the first lower positioning flange isused for realizing positioning of the upper fastener and a connectedpiece located above when two fasteners are connected to each other toconnect a plurality of connected pieces, and the positioning realizesthe coordination by the outer wall of the first lower positioning flangeand the connected piece located above.

Preferably, an upper positioning flange used for realizing positioningof fasteners and connected pieces is provided on the upper surface ofthe outer slab, and the positioning realizes the coordination by theouter wall of the upper positioning flange and connecting through holesof the connected piece located below.

Further, preferably, a positioning rib is provided on an outer side ofthe post, and an outer surface of the positioning rib coordinates withinner surfaces of first lower positioning flanges of adjacent fastenerswhen the adjacent fasteners are connected.

Furthermore, preferably, a first limiting block used for limiting arelative rotation angle of the fifth outer boss relative to the secondinner flange is provided on the upper surface of the second innerflange.

Furthermore, preferably, a plurality of first outer bumps used foraccepting and transferring, to the outer slab, a torque for allowing thefastener to rotate are further provided on an outside surface of theouter slab.

Further, preferably, a first transmission through hole is formed in themiddle of the post, and the first transmission through hole is used forallowing a piece to pass through the first transmission through hole todrive the fastener to rotate in a circumferentially relatively fixedmanner.

To overcome the technical problems in the prior art, the presentinvention provides a connecting cap which is matched with the fastenerand can avoid the problem in the prior art that the danger to teenagersis possibly caused by a screwdriver when nuts and screws are used toconnect various pieces.

A connecting cap suited with the fastener is provided, wherein a secondhole is formed in a lower portion of the connecting cap, with a fourthinner flange being provided on an inner wall of the second hole, thefourth inner flange having a second gap greater than the width of thefifth outer flange of the fastener, and an upper surface of the fourthinner flange being used for abutting to the lower surface of the fifthouter boss of the fastener below the connecting cap when limiting theposition of the connected piece in the height direction of the post ofthe fastener.

When splicing pieces are connected via a fastener, the post of thefastener located below extends into a hole of the connecting cap locatedabove, and the fourth inner flange of the connecting cap located aboveis fastened by the fifth outer boss, so that the axial positions of twoconnected pieces are limited and the connection of the two connectedpieces is realized. More crucially, the disassembly of screws isrealized without tools which are possibly dangerous for children, suchas screwdrivers, and the use safety of connecting members for robotpieces is greatly improved, so that it is advantageous for thepopularization of robots in teenagers.

Preferably, a second bump used for matching with the first recess of thefastener located above is provided on the upper surface of the fourthinner flange;

or,

a second recess used for matching with the first bump of the fastenerlocated below is provided on the upper surface of the fourth innerflange.

Further, preferably, a second lower positioning flange is provided onthe lower surface of the fourth inner flange; the second lowerpositioning flange is used for realizing positioning of the connectingcap of the connected piece located above when the connecting cap and thefastener are connected to connect a plurality of connected pieces; and,the positioning realizes the coordination by the outer wall of thesecond lower positioning flange and the connecting through holes of theconnected piece located above.

Preferably, a second limiting block used for limiting a relativerotation angle of the fifth outer boss of the fastener relative to thefourth inner flange is provided on the upper surface of the fourth innerflange.

Further, preferably, a plurality of second outer bumps used foraccepting and transferring, to the outer slab, a torque for allowing theconnecting cap to rotate are further provided on an outside surface ofthe connecting cap.

Furthermore, preferably, a second transmission through hole is formed inthe middle of the post, and the second transmission through hole is usedfor allowing a piece to pass through the second transmission throughhole to drive the fastener and the connecting cap to rotate together ina circumferentially relatively fixed manner.

To overcome the technical problems in the prior art, the presentinvention provides an assembled component. During assembling theassembled component, no screwdriver is used, so that the problem in theprior art that the danger to teenagers is possibly caused by ascrewdriver when nuts and screws are used to connect various pieces maybe avoided.

An assembled component is provided, including:

a moving member, the moving member comprising a bar member having awidth and a thickness, the width of the bar member being four times ofthe thickness, a connecting through hole running through the bar memberin a thickness direction of the bar member being provided on the barmember;

a fixed member, a plurality of connecting through holes running throughthe fixed member in a thickness direction of the fixed member beingprovided on the fixed member; and

a fastener, which is any one fastener described above for passingthrough the connecting through holes to realize the connection betweenthe moving member and the fixed member.

During assembly, the assembled component is convenient for assembly, andthe connection between components is realized by tools possibly causingdanger. Moreover, the connection is reliable and will not be unlockedunexpectedly, so that the loose of screws due to the relative rotationbetween connected pieces is avoided when the screws are used forconnection. In addition, a transmission member may also allow to passtherethrough, without influencing the effects of the connected pieces.

Preferably, a third connecting hole and a fourth connecting hole areprovided on the moving member and/or the fixed member; the thirdconnecting hole is used for allowing the connected moving member and/orfixed member to do relative rotation when the fastener is connected toanother fastener or the fastener is connected to a connecting cap; thefourth connecting hole is used for allowing the connected moving memberand/or fixed member to be clamped by the fastener and/or the connectingcap when the fastener is connected to another fastener or the fasteneris connected to the connecting cap; and, a thickness of the movingmember and/or the fixed member on an edge of the third connecting holeis greater than a thickness of the moving member and/or the fixed memberon an edge of the fourth connecting hole.

By configuring the third connecting hole and the fourth connecting holeinto statuses of different hole wall heights, a same connecting membermay be used and the third connecting hole and the fourth connecting holemay be used for rotatable connection and fixed connection, so that thediversity of connection of pieces is realized while ensuring theuniversality of the pieces.

BRIEF DESCRIPTION OF FIGURES

FIG. 1 is a front view of a fastener in Embodiment 1;

FIG. 2 is a stereoscopic diagram of the fastener in Embodiment 1, whenviewed from the inclined top;

FIG. 3 is a stereoscopic diagram of the fastener in Embodiment 1, whenviewed from another angle of the inclined top;

FIG. 4 is a stereoscopic diagram of the fastener in Embodiment 1, whenviewed from the inclined bottom;

FIG. 5 is a partial schematic diagram of assembling of a first outerboss, a second outer boss and a first inner flange in variant 1 ofEmbodiment 2;

FIG. 6 is a partial schematic diagram of assembling of the first outerboss, the second outer boss and the first inner flange in variant 2 ofEmbodiment 2;

FIG. 7 is a partial schematic diagram of assembling of the first outerboss, the second outer boss and the first inner flange in variant 3 ofEmbodiment 2;

FIG. 8 is a partial schematic diagram of assembling of the first outerboss, the second outer boss and the first inner flange in variant 4 ofEmbodiment 2;

FIG. 9 is a partial schematic diagram of assembling of the first outerboss, the second outer boss and the first inner flange in variant 5 ofEmbodiment 2;

FIG. 10 is a stereoscopic diagram of a fastener connecting member inEmbodiment 3, when viewed from the inclined top;

FIG. 11 is a sectional view in a direction of FIG. 10;

FIG. 12 is a sectional view in another direction of FIG. 10;

FIG. 13 is a schematic diagram of connecting two fasteners with afastener connecting member;

FIG. 14 is a sectional view of FIG. 13;

FIG. 15 is a stereoscopic diagram of a bar member with six holes inEmbodiment 4;

FIG. 16 is a stereoscopic diagram of a bent plate member in Embodiment4;

FIG. 17 is a stereoscopic diagram of a motor output flange in Embodiment4;

FIG. 18 is a stereoscopic diagram of connecting a fastener with a barmember in Embodiment 5;

FIG. 19 is a sectional view of FIG. 18;

FIG. 20 is a stereoscopic diagram of connecting bar members together bya fastener and a connecting cap in Embodiment 5;

FIG. 21 is a sectional view of FIG. 20;

FIG. 22 is a stereoscopic diagram of connecting bar members in fourlayers together by two fasteners in Embodiment 5;

FIG. 23 is a sectional view of FIG. 22 in a length direction of the barmember in the fourth layer;

FIG. 24 is a sectional view of FIG. 22 in a length direction of the barmember in the second layer;

FIG. 25 is a stereoscopic diagram of connecting bar members together bya fastener and a fastener connecting member in Embodiment 7;

FIG. 26 is a sectional view of FIG. 25;

FIG. 27 is a front view of the fastener in Embodiment 7;

FIG. 28 is a side view of the fastener in Embodiment 7;

FIG. 29 is a stereoscopic diagram of the fastener in Embodiment 7, whenviewed from the inclined top;

FIG. 30 is a stereoscopic diagram of the fastener in Embodiment 7, whenviewed from another angle of the inclined top;

FIG. 31 is a stereoscopic diagram of the fastener in Embodiment 7, whenviewed from the inclined bottom;

FIG. 32 is a side view of a connecting cap in Embodiment 8;

FIG. 33 is a stereoscopic diagram of the connecting cap in Embodiment 8,when viewed from the inclined top;

FIG. 34 is a stereoscopic diagram of the connecting cap in Embodiment 8,when viewed from the inclined top;

FIG. 35 is a stereoscopic diagram of connecting bar members together bya fastener and a connecting cap in Embodiment 9, when viewed from theinclined top;

FIG. 36 is a stereoscopic diagram of connecting bar members together bya fastener and a connecting cap in Embodiment 9, when viewed from theinclined bottom;

FIG. 37 is a sectional view of connecting bar members together by afastener and a connecting cap in Embodiment 9, when viewed from onedirection of a center line of the fastener;

FIG. 38 is a sectional view of connecting bar members together by afastener and a connecting cap in Embodiment 9, when viewed from anotherdirection of the center line of the fastener;

FIG. 39 is a stereoscopic diagram of a bar member in Embodiment 10;

FIG. 40 is a sectional view of a vertical plane of the bar member ofFIG. 39 in the length direction;

FIG. 41 is a stereoscopic diagram when two bar members of FIG. 39 areconnected by a fastener and a connecting cap;

FIG. 42 is a sectional view of a vertical plane of the part assembly ofFIG. 39 in the length direction of the bar member; and

FIG. 43 is a sectional view of a vertical plane of the part assembly ofFIG. 39 at a fourth connecting hole in a width direction of the barmember.

DETAILED DESCRIPTION OF THE EMBODIMENTS

To further understand the summary, features and effects of the presentinvention, the following embodiments will be illustrated and describedbelow in detail.

Embodiment 1

In the drawings, the meanings of the reference signs are as follows:

1: post; 2: first outer boss; 3: outer slab; 4: first hole; 5: secondinner flange; 6: first gap; 7: first groove; 8: sixth rib; 9: secondouter boss; 10: upper positioning flange; 11: outer flange; 12: firstouter bump; 13: first transmission through hole; 14: first limitingblock; 15: third outer boss; and, 16: first occlusion portion.

A fastener is provided, including a post 1, wherein outer bosses areprovided in an upper portion of the post 1, with the outer bossesincluding first outer bosses 2 and second outer bosses 9, the firstouter bosses 2 being located under the second outer bosses 9, the firstouter bosses 2 and the second outer bosses 9 being located at differentpositions in a length direction of the post 1, and an upper surface ofeach of the first outer bosses 2 and a lower surface of each of thesecond outer bosses 9 being used for clamping a first inner flange on aninner wall of a first through hole of a connected splicing piece; and,an outer slab 3 perpendicular to the post 2 is provided in a lowerportion of the post 1, and the outer slab 3, the first outer bosses 2and the second outer bosses 9 are used for limiting the positions of aplurality of the connected splicing pieces along a height direction ofthe post 1.

By providing first outer bosses 2 and second outer bosses 3 in the upperportion of the post 1 and by clamping a first inner flange of a splicingpiece using the first outer boss and the second outer boss, the relativeaxial position of one splicing piece relative to the fastener may belimited. Moreover, the axial positions of other connected splicingpieces may further be limited by fitting the splicing pieces to an upperplane of the outer slab 3, so that the axial positions of a plurality ofsplicing pieces on the fastener may be limited without connecting otherlocking components or fasteners on the top of the fastener. Thus, thenumber of pieces to be mounted during connection is reduced, and theassembly efficiency of robots is improved.

Preferably, at least one of the upper surface of each of the first outerbosses 2 and the lower surface of each of the second outer bosses 9 is aslope which forms an acute angle with an axis of the post 1; and, in aplane of the axis of the post 1, the upper surface of each of the firstouter bosses 2 and the lower surface of each of the second outer bosses9 form a wedge-shaped gap with a smaller interior and a larger exterior.

By configuring the upper surface of each of the first outer bosses 2and/or the lower surface of each of the second outer bosses 9 into aslope and allowing the both to form a wedge-shaped gap, when the firstinner flange is allowed to rotate to a region between the two surfaces,the first through hole can be aligned to the post 1, so that theposition accuracy of splicing pieces and the fastener in the radialdirection of the fastener is ensured, and the radial positioning of theboth is realized without separately providing a spliced positioningcomponent.

Further, preferably, there are two first outer bosses 2 and twocorresponding second outer bosses 9. The first outer bosses 2 may extendoutward in the radial direction of the post 1. The first outer bosses 2and the second outer bosses 9 are oppositely provided in acircumferential direction of the post 1. A first groove 7 is provided onthe upper surface of each of the first outer bosses 2, a first groove 7is also provided on the lower surface of each of the second outer bosses9, and the two first grooves 7 have opposite positions. The uppersurface and lower surface of the first inner flange are provided withthird ribs matched with each of the first grooves 7.

By providing grooves and ribs on the opposite surfaces of the twobosses, the circumferential positions of the first and second outerbosses relative to the first inner flange may be limited, so that thedisengagement of two connected fasteners caused by the relative rotationof the first outer bosses 2 and the first inner flanges due tovariation, losing or other reasons is avoided, and the reliability ofconnection is improved.

By oppositely arranging the first outer bosses 2 and the second outerbosses 9, shorter first inner flanges may be provided in acircumferential direction of the first through hole, that is, thecircumferential positioning function of the outer bosses located aboveand below the first inner flange may be realized. Moreover, by providingthe shorter first inner flanges, it means that a gap between first innerflanges with a same height in the first through hole will increase, andthe increase of the gap may improve the possibility of inserting theouter bosses into the gap, the time required for inserting a fastenerinto the first through hole is reduced, and the assembly speed isimproved.

Specifically, chamfers are further provided on two side edges of thelower surface of each of the first outer bosses 2, which are parallel toor substantially parallel to the radial direction of the post 1. Thechamfers may reduce the resistance when the edges of the lower surfaceof each of the first outer bosses 2 move on the third ribs, so that itis convenient for users to realize positioning of the first grooves 7and the third ribs.

Preferably, the first outer bosses 2 and the second outer bosses 9 areoppositely provided in a circumferential direction of the post 1, andfirst occlusion portions 16 for occluding the first inner flanges areprovided on a same side of the first outer bosses 2 and the second outerbosses 9. Where there are multiple combinations of the first outerbosses 2 and the second outer bosses 9, the first occlusion portions 16between the first outer boss and the second outer boss 9 of each pair ofouter bosses should be in a same rotation direction, for example, in aclockwise rotation direction of the first grooves 7, or in acounterclockwise direction of the first grooves 7.

By providing the first occlusion portions 16, the first and second outerbosses 9 may be allowed to stop in the rotation process of the firstinner flanges, and the stop positions are positions where the first andsecond outer bosses 9 are matched with the first recesses/bumps of thefirst inner flanges, so that, during the rotation, the firstbumps/recesses are rotated out from the first grooves 7 after beingrotated into the first grooves, and the mounting efficiency is improved.Moreover, the arrangement of the first occlusion portions 16 may alsoprevent the coordination of the recesses and the bumps from unexpecteddisengagement, and the reliability of connection is also improved. Whenthe first and second outer bosses 9 are oppositely arranged in thecircumferential direction, by providing the first occlusion positions 16on a same side, the excessive relative rotation amplitude of the firstinner flanges with the both is avoided and the first inner flanges areprevent from rotating out from the both, and the relative frictionduring the rotation is reduced. Particularly, when the outer bosses orthe inner flanges have bumps, the abrasion of the bumps to the contactsurface may be reduced, and it is advantageous to improve the servicelife.

Preferably, the outer bosses further include a third outer boss 15 whichis provided on the top of the post 1. By providing the third outer boss15, the fastener may be connected to another fastener or a fastenerconnecting member, to increase the number of coaxial fasteners andconnect more splicing pieces; or, the fastener may be connected to aconnecting cap, to further lock a plurality of splicing pieces connectedby one fastener and thus improve the reliability of connection.

Further, preferably, a first hole 4 is formed within a local region ofthe outer slab 3 under the post 1, and a second inner flange 5 isprovided on an inner wall of the first hole 4. The second inner flange 5has a first gap 6 greater than the width of the third outer boss 15. Anupper surface of the second inner flange 5 is used for abutting to alower surface of the third outer boss 15 of the fastener located belowwhen limiting the position of the connected splicing piece in the heightdirection of the post 1. In this embodiment, two sections of the firstinner flange and two sections of the first gap 6 are provided on theinner wall of the first hole 4 in a staggered manner.

By providing a second inner flange 5 in the lower portion of thefastener, the fastener and an adjacent fastener may be connected by thecoordination of the second inner flange 5 and the third outer boss 15,so that the number of coaxial fasteners is increased, and more splicingpieces are connected and fixed or have a common axis of rotation.

Specifically, a sixth rib 8 is further provided on the upper surface ofthe second inner flange. The sixth rib 8 may be coordinated with thegroove on the lower surface of the third outer boss 15 to realize thecircumferential positioning of two connected fasteners.

Preferably, an outer flange 11 is provided on a side face of the outerslab 3. By providing an outer flange 11 on a side face of the outer slab3, during disassembling pieces, it is convenient to take out thefastener from the through hole of a splicing piece when the outer flange11 may be grasped with a fingernail or a finger. In addition, duringassembly, by grasping the outer flange 11 with a finger, the finger maybe prevented from touching the surface of a splicing piece due to a tooclose distance to the surface of the connected splicing piece and thusaffecting the relative position of the splicing piece.

An upper positioning flange 10 is provided on the upper surface of theouter slab 3 for realizing positioning of the fastener located below andthe connected piece located below when a plurality of fasteners areconnected together is provided at a junction with the post 1, and thepositioning realizes the coordination by the outer wall of the upperpositioning flange 10 and the connecting through holes of the connectingpiece located below. By the positioning of the upper positioning flange10 and the connected piece, the relative position of the fastener andthe lower one of the connected pieces is ensured to be stable, and thefastener is coordinated with the upper surface of the outer slab 3 toprevent the fastener from shaking on the connected piece.

Specifically, a first limiting block 14 used for limiting a relativerotation angle of the third outer boss 15 relative to the first innerflange is provided on the upper surface of the first inner flange. Inthis embodiment, the position of the first limiting block 14 is aposition where a side face at the front end of the third outer boss 15in a rotation direction is located, when the groove of the third outerboss exactly moves to the sixth rib.

By providing a first limiting block 14 on the upper surface of thesecond inner flange 5, it may be avoided that the third outer boss 15escapes from another first gap 6 of the flange due to excessive rotationamplitude of the third outer boss 15 when two fasteners are connectedtogether. Particularly, when a sixth rib 8 is provided on the uppersurface of the second inner flange 5, a first limiting block 14 isprovided besides the sixth rib 8, so the third outer stop 15 may bestopped in the rotation process of the second inner flange 15, and thestop position is a position where the groove of the third outer boss 15is matched with the sixth rib 6 of the second inner flange. Thus, duringthe rotation, it is avoided that the sixth rib is rotated out from thegroove again after being rotated into the groove and the mountingefficiency is improved. Moreover, the arrangement of the first limitingblock 14 may also prevent the unexpected disengagement of the sixth riband the groove of the third outer boss in a certain direction, and thereliability of connection is also improved.

Specifically, four first outer bumps 12 used for accepting andtransferring, to the outer slab 3, a torque for allowing the fastener torotate are further provided on an outside surface of the outer slab 3.By providing the first outer bumps 12, it is convenient for users tohold fasteners and apply an enough torque to connect two fasteners.Particularly, when the first outer bosses 2 and the first inner flangesare cooperatively connected by the first grooves 7 and the first ribs, acertain acting force is to be transferred to the first ribs from thefirst grooves 7 to ensure the both to engage exactly. Specifically, byproviding the first outer bumps 12, the contact length between the outerslab 3 and the connected piece may be increased, and the connectionbetween the fastener and the connected piece may be more stable.

Specifically, a first transmission through hole 13 is formed in themiddle of the post 1, and the first transmission through holel3 is usedfor allowing a piece to pass through the first transmission through hole13 to drive the fastener to rotate in a circumferentially relativelyfixed manner. In this embodiment, the first transmission through hole 13has a cross-shaped cross section. Actually, the first transmissionthrough hole 13 may also have an orthohexagonal, square or regularlytriangular cross-section, to drive the fastener to rotate via atransmission piece.

By providing the first transmission through hole 13, when a plurality offasteners are connected together, a center bar may pass through theplurality of fasteners to drive the plurality of fasteners to rotatetogether. For example, during arranging a robot in form of a vehicle,wheels may be provided on two sides of the vehicle, and each wheel andan arm for mounting the wheel is mounted via the fastener. Specifically,first inner flanges synchronously rotating with the fastener may beprovided on the wheels, and positions where the arms are connected tothe fasteners may be threaded holes; and, a long bar passes through thefasteners on the two sides of the vehicle to realize the synchronousrotation of the wheels on the two sides. Meanwhile, the bar members orplaty pieces connected by the fasteners are not influenced, and theflexibility of the mechanical design is increased. This cannot berealized by the screw connection in the prior art. Moreover, by allowingnon-circular pieces to pass through a plurality of fastener caps, aplurality of fasteners may be locked in the circumferential direction toavoid the relative relation between the fasteners and thus improve thereliability of connection, and the anti-rotation effects at firstrecesses and first bumps may be replaced in a certain sense.

Embodiment 2

To conveniently and quickly show the correspondence, in the drawings,the outer bosses or inner flanges are shown as rectangles. Actually, itis not limited that the outer bosses or inner flanges must berectangular in this projection direction. Moreover, there are factorsnot involved the first occlusion portion in the drawings. The newreference signs have the following meanings: 17: first rib; 18: secondrib; 19: third rib; and, 20: first inner flange.

This embodiment shows several variants based on Embodiment 1. Adifference between these variants and Embodiment 1 mainly lies in thatthe distribution mode of the first outer boss 2 and the second outerboss 9 and the distribution mode of the recesses and bumps on the outerbosses are different. In Embodiment 1, the first outer boss 2 and thesecond outer boss 9 are located at same positions of the post in thecircumferential direction, first grooves 17 are provided on the uppersurface of the first outer boss 2 and the lower surface of the secondouter boss 9, and first ribs 17 are provided at same positions of theupper surface and lower surface of the first inner flange 20. Actually,there may be variants in the following forms.

Variant 1:

As shown in FIG. 5, a first groove 17 is provided on the lower surfaceof the second outer bosses 9, and a third rib 19 matched with the firstgroove 17 is provided on the upper surface of the first inner flange 20;or, the first inner flange 20 and the second outer boss 9 may also bepositioned circumferentially. Similarly, a first groove is provided onthe upper surface of the first outer boss 2, and a third rib 19 matchedwith the first groove is provided on the lower surface of the firstinner flange 20.

Variant 2:

As shown in FIG. 6, bumps or recesses are not provided on both the firstouter boss 2 and the second outer boss 9. In this case, the basic axialpositioning function may be realized, but the ability to resistcircumferential rotation is poor, and the fastener still may becomeloose after connected to a splicing piece.

Variant 3:

As shown in FIG. 7, first ribs 17 are provided on the upper surface ofthe first outer boss 2 and the lower surface of the second outer boss 9in a sample pair of oppositely arranged outer bosses; second ribs 18 areprovided on both the upper surface and the lower surface of the firstinner flange 20, and the second ribs 18 have a same circumferentialposition on the same first inner flange 20; and, the two first ribs 17on the same pair of outer bosses are located on two sides of the upperand lower second ribs 18. By taking rotating the first inner flange 20to the left side of FIG. 7 as example, when the first inner flange 20 isrotated relative to the first and second outer bosses 9, the uppersecond rib 18 passes over the first rib 17 on the lower surface of thesecond outer boss, while the lower second rib 18 encounters the firstrib 17 on the upper surface of the first outer boss 2, and cannot passover the first rim 17 located below if a torque is not appliedcontinuously. Therefore, the first outer boss 2 may be circumferentiallypositioned by such a structure. The axial positioning may be realized bythe upper and lower surfaces of the second ribs 18 and the coordinationof the opposite surfaces of the first and second outer bosses 9.

With such a structure, since the first inner flange 20 and the outerbosses are rotated relatively, it is only required to overcome thefriction generated when the second rib 18 comes into contact with thefirst rib 17, and the friction area is reduced greatly, so that the timerequired for applying a larger force to maintain rotation and it isconvenient for assembly. Of course, since the reduction of the contactmaterial may quicken the wear speed of the first and second ribs 18,this variant solution may be suitable for a case where less assemblingtimes are required.

Variant 4:

As shown in FIG. 8, slightly different from the variant 3, a pair offirst ribs 17 is provided on the first outer boss 2, a second rib 18 isprovided on the lower surface of the first inner flange 20, and thesecond rib 18 is located between the pair of first ribs 17 when asplicing piece is in snap-in connection to a fastener. By taking thefirst inner flange 20 being rotated to the left side of FIG. 8 asexample, when the first inner flange 20 is rotated relative to the firstand second outer bosses 17, the upper second rib 18 first passes overthe first rib 17 on the lower surface of the second outer boss, whilethe other first rib 17 is occluded. If a torque is not appliedcontinuously, the other first rib 17 cannot be passed over. Therefore,such a structure may be used to circumferentially position the firstouter boss 2. The axial positioning may be realized by contacting theupper surface of the second rib 18 with the upper surface of the firstouter boss 2 and contacting the upper surface of the first inner flange20 with the lower surface of the second outer boss 9.

Of course, the two first ribs 17 in this variant 4 may also be providedon the lower surface of the second outer boss, and the second rib 18 ischanged correspondingly.

Variant 5:

As shown in FIG. 9, slightly different from the variant 3, by taking twopairs of outer bosses as example, the first outer boss 2 and the secondouter boss 9 in each pair of outer bosses are provided at differentcircumferential positions; a first rib 17 is provided on the uppersurface of the first outer boss 2; a first rib 17 is provided on thelower surface of the second outer boss 9; second ribs 18 are provided onboth the upper surface and the lower surface of the first inner flange20; and, the two second ribs 18 are located at different circumferentialpositions of the first inner flange 20. When a splicing piece is snappedonto a fastener, a first rib 17 is provided on one side of the secondrib 18 on the upper or lower surface of each of the first inner flange20 to limit the second rib 18 to the circumferential position, so thatit is ensured that the slicing piece and the fastener will notrelatively rotate in the circumferential direction of the first innerflange 20. Although it may be seen from FIG. 9 that the first ribs 17and the first and second outer bosses 9 cannot limit the rotation of thefirst inner flange 20 in the shown counterclockwise direction, since thecombination of the first rib 17, the first outer boss 2 and the secondouter boss 9 on the left side of FIG. 9 is actually located on theopposite side of a paper surface and the distribution direction isopposite to the direction shown in FIG. 9, the rotation of the firstinner flange relative to the post in the shown counterclockwisedirection may be limited. Hence, the circumferential positioningfunction is realized, and the degree of freedom in the axial directionperpendicular to the paper surface is also limited.

In conclusion, various positioning structures may be designed by thoseskilled in the art under the teaching of the present application and incombination with the factors “whether there are bumps and recesses forcoordination to realize the circumferential positioning”, “whether thefirst outer bosses and the second outer bosses are overlapped atpositions in the circumferential direction of the post”, “whether thefirst bump/first recess is provided on a single surface or both surfacesof the first inner flange” and “the coordination with the bump of thefirst inner flange is realized by a recess or a bump”, and thesepositioning structures shall fall into the protection scope of thepresent application and will not be repeated one by one.

Embodiment 3

New reference signs have the following meanings: 21: third through hole;22: third inner flange; and, 23: fifth rib.

A fastener connecting member suited with the fastener has a thirdthrough hole, two layers of third inner flanges 22 are provided on theinner wall of the third through hole 21 at different heights. Two pairsof third inner flanges 222 are provided at different circumferentialpositions. There are total four third inner flanges 220 used for beingclamped by adjacent outer bosses of the fastener, for example, beingclamped by the third outer boss 15 and the second outer boss 9. Eachlayer of the third inner flanges 22 is matched with the outer bosses ofthe fastener for clamping the fastener connecting member.

By providing a plurality of third inner flanges 22, different innerflanges may be coordinated with outer bosses of different fasteners toconnect a plurality of fasteners together. Thus, the length of thefasteners is increased in disguise, and more splicing pieces areconnected at a same position.

Preferably, at least one of the upper surface and the lower surface ofeach of the third inner flanges 22 is a slope which forms an acute anglewith the axis of the post; the upper surface and the lower surface ofeach of the third inner flanges 22 form a wedge in a plane of the axisof the post; and, the third inner flanges 22 are coordinated withadjacent outer bosses to realize the radial positioning of the fastenerconnecting member and the fastener.

By making the cross-section of each of the third inner flanges 22 as awedge, the third inner flanges 22 may be coordinated with the outerbosses to realize the self-centering of the first through hole and thepost. Thus, the coaxiality of a plurality of fasteners connected to asame fastener connecting member is ensured, the coaxiality of the firstthrough holes and the second through holes of a plurality of splicingpieces at this position is improved, and the smooth operation of a robotis ensured.

Preferably, fifth ribs 23 matched with the first grooves 7 are providedon the third inner flanges 22.

By providing fifth ribs 23 on the third inner flanges 22, thecircumferential position of the third outer boss 15 relative to thethird inner flanges 22 may be limited, so that the disengagement of twoconnected fasteners caused by the relative rotation of the third innerboss 15 and the third inner flanges 22 due to variation, loosing orother reasons is avoided, and the reliability of connection is improved.

As shown FIGS. 13 and 14, FIG. 13 shows a case of two fasteners and asame fastener connecting member. The two fasteners are in snap-inconnection to one layer of the third inner flanges 22 of the fastenerconnecting member by respective third inner outer bosses 15 and secondouter bosses 9.

Embodiment 4

New reference signs have the following meanings: 31: first through hole;32: second through hole; 33; motor output sleeve; and, 34: axial rib.

A splicing piece suited with the fastener is provided, wherein at leasta local portion of the splicing piece is a platy portion; connectingthrough holes are provided in the platy portion, and the connectingthrough holes include a first through hole; and, a first inner flangeused for being clamped by the lower surface of the first outer boss andthe upper surface of the second outer boss is provided on the inner wallof the first through hole.

By providing the first inner flange 20 in the through hole of thesplicing piece, the first and second outer bosses in the upper portionof the post may be clamped, and the relative axial position of onesplicing piece and the fastener may be limited. Moreover, the axialpositions of other connected splicing pieces may also be limited by thissplicing piece and in conjunction with the outer slab. Thus, the axialpositions of a plurality of splicing pieces on the fastener may belimited without other locking components or fasteners connected on thetop of the fastener. As a result, the number of pieces to be mountedduring connection is reduced, and the assembly efficiency of robots isimproved.

Preferably, at least one of the upper surface and the lower surface ofthe first inner flange is a slope which forms an acute angle with theaxis of the post, the upper surface and the lower surface of the firstinner flange form a wedge in a plane of the axis of the post, and thefirst inner flange is coordinated with the first outer boss and thesecond outer boss to realize the radial positioning of the splicingpiece and the fastener.

By making the cross-section of the first inner flange be a wedge, thefirst inner flange may be coordinated with the first and second outerbosses to realize the self-centering of the first through hole and thepost, so that the positioning accuracy of the connection of the splicingpiece and the fastener is ensured.

Preferably, a second recess or a second bump matched with the first bumpor a third bump matched with the first recess is provided on the firstinner flange.

By providing a recess and/or a bump on the first inner flange, thecircumferential positions of the first and second outer bosses relativeto the first inner flange may be limited. Consequently, thedisengagement of two connected fasteners caused by the relative rotationof the first outer boss and the first inner flange due to the vibration,loosing or other reasons is avoided, and the reliability of connectionis improved.

Preferably, the connecting through holes further include a secondthrough hole which is an unthreaded hole. An upper positioning flange isprovided on the upper surface of the outer slab of the fastener. Theupper positioning flange is used for realizing positioning of thefastener and a lower one among a plurality of splicing pieces sheathedon the post, and the positioning realizes the coordination by the outerwall of the upper positioning flange and the inner wall of the secondthrough holes of the lower splicing piece.

By positioning the upper positioning flange and the second through hole,it is ensured that the relative position of the fastener and the lowerone among the plurality of splicing pieces is stable, and the shaking ofthe fastener on the splicing piece is avoided by the coordination withthe upper surface of the outer slab.

Preferably, the splicing member is a bar member, the connecting throughholes are distributed on a center line of the bar member, and a sidebump protruded from a side wall body is further provided on a side wallof the bar member on an outer side of the second through hole.

When a plurality of bar members are overlaid together, by side bumps onthe side walls of the bar members, holes in the side bumps may bedistinguished as first through holes or second through holes. As aresult, the discrimination degree of geometric elements in a pluralityof pieces mounted together is improved, and it is convenient forallowing a corresponding shaft or other pieces to pass therethrough.

Only several splicing pieces are listed below, and are not intended tolimit the forms of the splicing pieces.

1. As shown in FIG. 15, a six-hole bar member is shown. There are sixthrough holes on the bar member. Three first through holes 31 and threesecond through holes 32 are arranged at intervals. A side bump protrudedfrom a side wall body is further provided on a side wall of the barmember on an outer side of the second through holes 32, so as todistinguish that the through holes on the bar member are first throughholes 31 or second through holes 32 when a plurality of bar members areoverlaid. In the first through holes 31 of the bar member, both theupper and lower surfaces of the first inner flange 20 are slopes, andthird ribs 19 are provided on the upper and lower surfaces.

2. As shown in FIG. 16, a bent bar member is shown, including a slab andvertical plates on two sides of the slab. Holes on the vertical platesare first through holes 31. The surfaces of first inner flanges 20 ofthe first through holes 31 in contact with the outer bosses are slopes.For the first through holes 31 on the slab, the upper surfaces of thefirst inner flanges 20 cannot be manufactured into slopes and areplanes, and the lower surfaces of the first inner flanges 20 may beslopes. Third ribs 19 are provided on both the upper surfaces and lowersurfaces of the first inner flanges 20.

3. As shown in FIG. 17, a motor output flange is shown, including a slabportion and a motor output sleeve 33 provided in a center of the slabportion. A plurality of axial ribs 34 are provided on the inner wall ofthe motor output sleeve 33, and the plurality of axial ribs 34 mayrealize spline fitting with an output shaft of a motor. In the slabportion of the motor output flange, a plurality of first through holes31 are uniformly distributed by using the axis of the motor outer sleeve33 as a center, and upper and lower surfaces of the first inner flanges20 in the first through holes are slopes and provided with third ribs19.

Embodiment 5

The new reference sign has the following meaning: 41: eighth rib.

An assembled component is provided, including the fastener and thesplicing piece.

When the splicing piece and the fastener are used, the splicing piecemay be directly connected to the fastener and axially positioned,without mounting other pieces, so that the assembly efficiency of robotsis improved.

FIGS. 18 and 19 show a case where a fastener is jointed to splicingpieces, where each of the two connected splicing pieces is a three-holebar member, with a hole in the middle of the three-hole bar member beinga first through hole 31 and holes at two ends being second through holes32. In the drawings, the fastener passes through the first through hole31 of the upper three-hole bar member and the second through holes 32 ofthe lower splicing piece. The first inner flange of the upper splicingpiece is clamped by the first outer boss 5 and the second outer boss 9,and the third rib is matched with the first groove 7 on the uppersurface of the first outer boss 5 and the first groove 7 on the lowersurface of the second outer boss 9, so it is unable to do relativerotation; however, the second through holes 32 of the lower splicingpiece and the upper positioning flange 10 are positioned radially, it isthus able to do relative rotation.

The drawings show a case where three-hole bar members are connected tothe fastener. Actually, a case where bar member with other number ofholes or other bent plates or motor output flange pieces are connectedto a fastener may also refer to this embodiment.

FIGS. 20 and 21 show a case where bar members are connected together bya fastener and a connecting cap. A connecting cap is further mounted onthe top of the fastener. The connecting cap in this embodiment refers tothe connecting cap in Embodiment 8, and has a smaller thickness thanthat of the connecting cap in Embodiment 8. Further, the fastener has noupper and lower positioning flanges on the bottom of the fastener shownin Embodiment 8. The eighth rib 41 of the inner flange of the connectingcap is coordinated with the groove on the lower surface of the thirdboss 15, so that the relative rotation of the connecting cap and thefastener may be avoided.

FIGS. 22-24 show a case where four bar members are connected together bytwo fasteners, where the four bar members are defined as first to fourthbar members from up to down. The lower fastener is in snap-in connectionto the first through hole 31 of the second bar member, and the firstinner flange 20 of the first through hole 31 of the fourth bar member isin snap-in connection to the first and outer bosses 9 of the upperfastener. Since there is an angle of 90° between the six ribs and thefirst outer bosses in the fasteners, the two fasteners are staggered at90° after the six rib 8 of the upper fastener is matched with the grooveof the third outer boss 15. Therefore, the second bar member in snap-inconnection to the lower fastener and the fourth bar member in snap-inconnection to the upper fastener are also staggered at 90°. Since thesecond through holes 32 of the first bar member are sheathed on thelower portion of the lower fastener, the first bar member may rotaterelative to the lower fastener; similarly, the third bar member may alsorotate relative to the upper fastener.

Embodiment 6

A difference between this embodiment and Embodiment 6 lies in that afastener connecting member is further included.

FIGS. 25 and 26 show a case where two bar members are connected togetherby a fastener and a fastener connecting member. The two bar members aremounted in a lower portion of the post 1 of the lower fastener and in anupper portion of the post 1 of the upper fastener through second throughholes. Each fastener is clamped by the first outer boss 5, the secondouter boss 9 and the third inner flange 22 of the fastener connectingmember. The two fasteners are unable to do relative rotation whendisassembly/assembly is not performed. Since each bar member is mountedat a position on the post without an outer boss and sheathed on thefastener through the second through holes 32, each bar member may rotaterelative to the combination of the fasteners.

Embodiment 7

New reference signs have the following meanings: 51: fifth outer boss;55: ninth groove; 53: first lower positioning flange; and, 54:positioning rib.

A fastener is provided, including a post 1, wherein fifth outer bosses51 are provided in an upper portion of the post 1, and an outer slab 3perpendicular to the post 1 is provided in a lower portion of the post1. A first hole 4 is provided within a local region of the outer slab 3below the post 1, and a second inner flange 5 is provided on an innerwall of the first hole 4. The second inner flange 5 has a first gap 6greater than the width of the fifth outer bosses 51. The upper surfaceof the second inner flange 5 is used for abutting to the lower surfacesof the fifth outer bosses 51 of the lower fastener when limiting theposition of the connected piece in the height direction of the post 1.In this embodiment, two sections of the second inner flange 5 and twosections of the first gap 6 are provided on the inner wall of the firsthole 4 in a staggered manner. Each section of the second inner flange 5and each section of the first gap 6 are equivalent to ¼ of thecircumference of the inner wall at this height.

When two fasteners are connected together, the post 1 of the lowerfastener extends into a hole of the upper fastener, and the second innerflange 5 of the upper fastener is fastened by the fifth outer bosses 51,so that the axial positions of two connected pieces are limited and theconnection of the two connected pieces is realized. Moreover, since theouter slab 3 allows the enveloped shape of the connected components tobe conical as a whole and the outer bosses will become factors forhindering the rolling of fasteners, the fasteners will not roll for along distance, and the problem of the missing of screws is avoidedduring the use of screws. More crucially, the disassembly/assembly ofscrews is realized without tools which are possibly dangerous forchildren, such as screwdrivers, and the use safety of connecting membersfor robot pieces is greatly improved, so that it is advantageous for thepopularization of robots in teenagers.

Specifically, there are two fifth outer bosses 51. The fifth outerbosses 51 may extend outward in the radial direction of the post 1.Ninth grooves 55 are provided on the lower surfaces of the fifth outerbosses 51, and sixth ribs 8 used for matching with the ninth grooves of55 of the lower fastener are provided on the upper surface of the secondinner flange 5. Particularly, chamfers are further provided on two sideedges of the lower surface of each of the fifth outer bosses 51, whichare parallel to or substantially parallel to the radial direction of thepost. The chamfers may reduce the resistance when the edges of the lowersurface of each of the fifth outer bosses 51 move on the six ribs 8, sothat it is convenient for users to realize positioning of the ninthgrooves 55 and the sixth ribs 8.

By providing ninth grooves 55 on the lower surfaces of the fifth outerbosses 51 and providing sixth ribs 8 matched with the ninth grooves onthe upper surface of the second inner flange 5, the circumferentialpositions of the fifth outer bosses 51 relative to the second innerflange 5 may be limited. Consequently, the disengagement of twoconnected fasteners caused by the relative rotation of the fifth outerbosses 51 and the second inner flange 5 due to the vibration, loosing orother reasons is avoided. As a result, the reliability of connection isimproved.

Specifically, a first lower positioning flange 53 is provided on thelower surface of the outer slab 3, the first lower positioning flange isused for realizing positioning of the upper fastener and a connectedpiece located above when two fasteners are connected to each other toconnect a plurality of connected pieces, and the positioning realizesthe coordination by the outer wall of the first lower positioning flange53 and the connecting through holes of the connected piece locatedabove. To decrease the processing difficulty of the fasteners, the firstlower positioning flange 53 may extend downward from the lower surfaceof the second inner flange 5.

By positioning the upper positioning flange 53 and the connected pieces,the position of the fastener relative to the lower one of the connectedpieces is ensured to be stable, and the fastener is coordinated with theupper surface of the outer slab 3 to prevent the fastener from shakingon the connected piece.

Specifically, a positioning rib 11 is provided on an outer side of thepost 1, and an outer surface of the positioning rib 11 coordinates withthe inner surface of the first lower positioning flange 53 of anadjacent fastener when it is connected to the adjacent fastener.

By providing the positioning rib 11 matched with the inner surface ofthe first lower positioning flange 53, the positioning of thepositioning rib 11 and the inner surface of the first lower positioningflange 53 is realized, and the relative positions of the upper and lowerfasteners are ensured. Moreover, the positioning measures for thefasteners and connected pieces may reliably ensure the mutualpositioning between the connected pieces.

Specifically, a first limiting block 14 used for limiting a relativerotation angle of the fifth outer bosses 51 relative to the second innerflange 5 is provided on the upper surface of the second inner flange 5.In this embodiment, the position of the first limiting block 14 is aposition where a side face at the front end of the fifth outer bosses 51in a rotation direction is located, when the ninth grooves 55 exactlymove to the sixth ribs 8.

By providing a first limiting block 14 on the upper surface of thesecond inner flange 5, it may be avoided that the fifth outer bosses 51escape from another first gap 6 of the flange due to excessive rotationamplitude of the fifth outer bosses 51 when two fasteners are connectedtogether. Particularly, when a sixth rib 7 is provided on the uppersurface of the second inner flange 5, a first limiting block 14 isprovided besides the sixth rib 8, the fifth outer bosses 51 may bestopped in the rotation process of the second inner flange 5, and thestop position is a position where the ninth grooves 55 of the fifthouter bosses 15 are matched with the sixth ribs 8 of the second innerflange 5. Thus, during the rotation, it is avoided that the sixth ribs 8are rotated out from the ninth grooves 55 again after being rotated intothe ninth grooves, and the mounting efficiency is improved. Moreover,the arrangement of the first limiting block 14 may also prevent theunexpected disengagement of the sixth ribs and the ninth grooves 55 in acertain direction, and the reliability of connection is also improved.

Specifically, four first outer bumps 12 used for accepting andtransferring, to the outer slab 3, a torque for allowing the fastener torotate are further provided on an outside surface of the outer slab 3.

Specifically, a first transmission through hole 13 is formed in themiddle of the post 1, and the first transmission through holel3 is usedfor allowing a piece to pass through the first transmission through hole13 to drive the fastener to rotate in a circumferentially relativelyfixed manner. In this embodiment, the first transmission through hole 13has a cross-shaped cross-section. Actually, the first transmissionthrough hole 13 may also have an orthohexagonal, square or regularlytriangular cross-section, to drive the fastener to rotate via atransmission piece.

By providing the first outer bumps 12, it is convenient for users tohold fasteners and apply an enough torque to connect two fasteners.Particularly, when the fifth outer bosses 51 and the second inner flange5 are cooperatively connected by the ninth grooves 5s and the sixth ribs8, a certain acting force is to be transferred to the sixth ribs 8 fromthe ninth grooves 55 to ensure the both to engage exactly. Specifically,by providing the first outer bumps 12, the contact length between theouter slab 3 and the connected pieces may be increased, and theconnection between the fastener and the connected pieces may be morestable.

By providing the first transmission through hole 13, when a plurality offasteners are connected together, a center bar may pass through theplurality of fasteners to drive the plurality of fasteners to rotatetogether. For example, during arranging a robot in form of a vehicle,wheels may be provided on two sides of the vehicle, and each wheel andan arm for mounting the wheel is mounted via the fastener. Then, a longbar passes through the fasteners on the two sides of the vehicle torealize the synchronous rotation of the wheels on the two sides.Meanwhile, the bar members or platy pieces connected by the fastenersare not influenced. Moreover, the flexibility of mechanical design isenhanced. This cannot be realized by the screw connection in the priorart. Moreover, by allowing non-circular pieces to pass through aplurality of fastener caps, a plurality of fasteners may be locked inthe circumferential direction to avoid the relative relation between thefasteners and thus improve the reliability of connection, and theanti-rotation effects at ninth recesses and ninth bumps may be replacedin a certain sense.

Embodiment 8

New reference signs have the following meanings: 61: fourth innerflange; 62: second gap; 63: ninth rib; 64: second lower positioningflange; 65: second limiting block; 66: second outer bump; and, 67:second transmission through hole.

A connecting cap suited with the fastener is provided, wherein a secondhole is formed in a lower portion of the connecting cap. A fourth innerflange 61 is provided on an inner wall of the second hole. The fourthinner flange 61 has a second gap 62 greater than the width of the fifthouter boss of the fastener. An upper surface of the fourth inner flange61 is used for abutting to the lower surface of the fifth outer boss ofthe fastener below the connecting cap when limiting the position of theconnected piece in the height direction of the post of the fastener.

Specifically, a ninth rib 63 matched with the ninth groove of the lowerfastener is provided on the upper surface of the fourth inner flange 61.

Further, specifically, a second lower positioning flange 64 is providedon the lower surface of the fourth inner flange 61; the second lowerpositioning flange 64 is used for realizing positioning of theconnecting cap and the connected piece located above when the connectingcap and the fastener are connected to connect a plurality of connectedpieces; and, the positioning realizes the coordination by the outer wallof the second lower positioning flange 64 and the connecting throughholes of the connected piece located above. To decrease the processingdifficult of fasteners, the second lower positioning flange 64 mayextend downward from the lower surface of the fourth inner flange 61,and the head end and tail end of the second lower positioning flange 64in an arc direction are aligned to the head end and tail end of thefourth inner flange 61 in the arc direction.

Specifically, a second limiting block 65 used for limiting the relativerotation angle of the fifth outer boss relative to the fourth innerflange 61 is provided on the upper surface of the fourth inner flange61.

Further, specifically, a plurality of second outer bumps 66 used foraccepting and transferring, to the outer slab, a torque for allowing theconnecting cap to rotate are further provided on an outside surface ofthe connecting cap.

Furthermore, specifically, a second transmission through hole 67 isformed in the middle of the connecting cap, and the second transmissionthrough hole 67 is used for allowing a piece passing through the secondtransmission through hole 67 to drive the fastener and the connectingcap to rotate together in a circumferentially relatively fixed manner.In this embodiment, the second transmission through hole 67 has across-shaped section-section. Actually, the second transmission throughhole 67 may also have an orthohexagonal, square or regularly triangularcross-section, to drive the fastener to rotate via a transmission piece.

When splicing pieces are connected via fasteners, the post of the lowerfastener extends into a hole of the connecting cap located above, andthe fourth inner flange 61 of the connecting cap located above isfastened by the fifth outer boss, so that the axial positions of twoconnected pieces are limited and the connection of the two connectedpieces is realized. More crucially, the disassembly of screws isrealized without tools which are possibly dangerous for children, suchas screwdrivers, and the use safety of connecting members for robotpieces is greatly improved, so that it is advantageous for thepopularization of robots in teenagers.

By providing a ninth rib 63 on the upper surface of the fourth innerflange 61, the circumferential position of the fifth outer boss relativeto the fourth inner flange 61 may be limited. Consequently, thedisengagement of two connected fasteners caused by the relative rotationof the fifth outer boss and the fourth inner flange 61 due to thevibration, loosing or other reasons is avoided, and the reliability ofconnection is improved.

By positioning the second lower positioning flange 64 and the connectedpieces, the position of the connecting cap relative to the lower one ofthe connected pieces is ensured to be stable, and the connecting cap iscoordinated with the upper surface of the outer slab to prevent theconnecting cap from shaking on the connected pieces.

By providing a second limiting block 65 on the upper surface of thefourth inner flange 61, it may be avoided that the fifth outer bossescapes from another gap of the fourth inner flange 61 due to excessiverotation amplitude of the fifth outer boss when the connecting cap isconnected to the fastener. Particularly, when a ninth rib 63 is providedon the upper surface of the fourth inner flange 61, a second limitingblock 65 is provided besides the ninth rib 63, so the fifth outer bossmay be stopped in the rotation process of the second inner flange, andthe stop position is a position where the ninth groove of the fifthouter boss is matched with the ninth rib 63 of the fourth inner flange61. Thus, during the rotation, it is avoided that the ninth rib 63 isrotated out from the ninth groove again after being rotated into theninth groove and the mounting efficiency is improved. Moreover, thearrangement of the second limiting block 65 may also prevent theunexpected disengagement of the ninth groove and the ninth rib 63 in acertain direction, and the reliability of connection is also improved.

By providing the second outer bumps 66, it is convenient for users tohold fasteners and apply an enough torque to connect two fasteners.Particularly, when the fifth outer boss and the fourth inner flange arecooperatively connected by the groove and the rib, a certain actingforce is to be transferred to the ninth rib 63 from the ninth groove toensure the both to engage exactly. Particularly, by providing the secondouter bumps 66, the contact length between the outer slab and theconnected pieces may be increased, and the connection between thefasteners and the connected pieces may be more stable.

By providing the second transmission through hole 67, when a pluralityof fasteners are connected together, a center bar may pass through theplurality of fasteners to drive the plurality of fasteners and theconnecting cap to rotate together. For example, during arranging a robotin form of a vehicle, wheels may be provided on two sides of thevehicle, and each wheel and an arm for mounting the wheel is mounted viathe fastener. Then, a long bar passes through the fasteners on the twosides of the vehicle to realize the synchronous rotation of the wheelson the two sides. Meanwhile, the bar members or platy pieces connectedby the fasteners are not influenced, and the flexibility of themechanical design is increased. This cannot be realized by the screwconnection in the prior art. Moreover, by allowing non-circular piecesto pass through a plurality of fasteners and connecting caps, theplurality of fasteners and the connecting caps may be locked in thecircumferential direction to avoid the relative relation between thefasteners and/or the connecting caps and thus improve the reliability ofconnection, and the anti-rotation effects at ninth recesses and ninthbumps may be replaced in a certain sense.

Embodiment 9

New reference signs have the following meanings: 71: first bar member;72: second bar member; 73: third bar member; and, 74: fourth bar member.

An assembled component is provided, including:

a moving member, the moving member including bar members each having awidth and a thickness, the width of each of the bar members being fourtimes of the thickness, connecting through holes running through the barmembers in a thickness direction of the bar members being provided onthe bar members;

a plurality of connecting through holes running through the fixed memberin a thickness direction of the fixed member being provided on the fixedmember; and

a fastener, which is any one fastener described above for passingthrough the connecting through holes to realize the connection betweenthe moving member and the fixed member.

During assembly, the assembled component is convenient for assembly, andthe connection between components is realized by tools possibly causingdanger. Moreover, the connection is reliable and will not be unlockedunexpectedly, so that the loose of screws due to the relative rotationbetween connected pieces is avoided when the screws are used forconnection. In addition, a transmission member may also be allowed topass therethrough, without influencing the effects of the connectedpieces.

FIGS. 35-38 show a case where four bar members are connected together byusing the fastener in Embodiment 7 and the connecting cap in Embodiment8.

The fourth bar member 74 is first sheathed on the bottommost fastener sothat the connecting through holes of the fourth bar member 74 arematched with the upper positioning flange of the fastener; and then, thethird bar member 73 is sheathed on the post 1 of the bottommostfastener. Subsequently, the middle fastener is sheathed on thebottommost fastener, and the fifth outer boss 51 of the bottommostfastener extends into the first hole of the middle fastener, so that thefifth outer boss 51 is slightly higher than the upper surface of thesecond inner flange 5 or aligned to the upper surface of the secondinner flange 5. First outer bosses 12 of the two fasteners are heldtogether, so that the middle fastener and the bottommost fastener dorelative rotation and the fifth outer boss 51 is rotated on the uppersurface of the second inner flange 5. Due to the presence of thechamfers, the fifth outer boss 51 will pass over the sixth rib 8 whenencountering the sixth rib 8, so that the ninth groove is engaged withthe sixth rib 8. As a result, the middle fastener is connected to thebottommost fastener. Meanwhile, the first lower positioning flange 53 ofthe middle fastener is matched with the connecting through holes of thethird bar member 73, and the middle fastener and the bottommost fastenerwill be positioned due to the coordination of the positioning rib andthe first lower positioning flange 53, so that the third bar member 73may be connected to the fourth bar member 74.

In this case, the second bar member 72 and the first bar member 71 aresuccessively sheathed on the middle fastener, so that the connectingthrough holes of the second bar member 72 are matched with the upperpositioning flange 10 of the middle fastener. Subsequently, theconnecting cap is sheathed on the middle fastener, and the fifth outerboss 51 of the bottommost fastener extends into the second hole of themiddle fastener, so that the fifth outer boss 51 is slightly higher thanthe upper surface of the fourth inner flange 61 or aligned to the uppersurface of the fourth inner flange 61. The first outer boss 12 of thebottommost fastener and the second outer boss 66 of the connecting capare held together, so that the middle fastener and the bottommostfastener do relative rotation, and the fifth outer boss 51 is rotated onthe upper surface of the fourth inner flange 61. Due to the presence ofthe chamfers, the fifth outer boss 51 will pass over the ninth rib 63when encountering the ninth rib 63, so that the ninth groove is engagedwith the ninth rib 63. Moreover, due to the presence of the secondlimiting block 65, the fifth outer boss 51 of the middle fastener willnot pass over the ninth rib 63, so that the middle fastener is connectedto the bottommost fastener. Meanwhile, the second lower positioningflange 64 of the middle fastener is matched with the connecting throughholes of the first bar member 71, and the middle fastener and thebottommost fastener will be positioned due to the coordination of thepositioning rib and the first lower positioning flange 53, so that thethird bar member 73 may be connected to the fourth bar member 74.

It is also possible to allow a cross-shaped driving bar to the firsttransmission through holes of the middle and bottommost fasteners andthe second transmission through hole 6767 of the connecting cap, so asto allow the driving bar to pass through the bar members, withoutinfluencing the functions of the bar members.

Since only one connecting through hole of each bar member is connectedvia fasteners, the bar members may rotate relative one another. Forexample, FIGS. 35 and 36 show that the first bar member 71 and thesecond bar member 72 are staggered at a certain angle. However, thethird bar member 73 and the third bar member 74 are aligned to oneanother. Thus, various states of the bar members are shown.

Embodiment 10

New reference signs have the following meanings: 75: fifth bar member;76: third connecting hole; 77: fourth connecting hole; 78: first annularrib; 79: second annular rib; and, 80: connecting rib.

Preferably, a third connecting hole 76 and a fourth connecting hole 77are formed on the moving member and/or the fixed member; the thirdconnecting hole 76 is used for allowing the connected moving memberand/or fixed member to do relative rotation when the fastener isconnected to another fastener or the fastener is connected to aconnecting cap; the fourth connecting hole 77 is used for allowing theconnected moving member and/or fixed member to be clamped when thefastener is connected to another fastener or the fastener is connectedto the connecting cap; and, a thickness of the moving member and/or thefixed member on an edge of the third connecting hole 76 is greater thana thickness of the moving member and/or the fixed member on an edge ofthe fourth connecting hole 77.

By configuring the third connecting hole 76 and the fourth connectinghole 77 into statuses of different hole wall heights, a same connectingmember may be used and the third connecting hole 76 and the fourthconnecting hole 77 may be used for rotatable connection and fixedconnection, so that the diversity of connection of pieces is realizedwhile ensuring the universality of the pieces.

In FIGS. 39 and 40, a third connecting hole 76 used for hinge jointbetween pieces is formed at two ends of the fifth bar member 75,respectively, and two fourth connecting holes 77 are formed in themiddle of the fifth bar member 75. The second annular ribs 79 on edgesof the fourth connecting holes 77 are slightly higher than the firstannular ribs 78 on edges of the third connecting holes 76, and collinearconnecting ribs 80 are provided between two second annular ribs 79 on asame side of the bar member on the edges of the two fourth connectingholes, and provided on an outer side of the two second annular ribs 79.The height of the connecting ribs 80 is the same as the height of thesecond annular ribs 79. That is, the surfaces of the connecting ribs 80are aligned to the surfaces of the second annular ribs 79. The uppersurfaces of the second annular rib 79 and the connecting rib 80 on theupper portion of the fifth bar member 75 and the lower surfaces of thesecond annular rib 79 and the connecting rib 80 on the lower portion ofthe fifth bar member 75 form two surfaces clamped by the bottom surfaceof the connecting cap and the upper surface of the outer slab. In theconnection shown in FIGS. 37 and 38 of Embodiment 9, there is a verysmall slit between the lower surface of the connecting cap and the firstbar member; however, in FIGS. 42 and 43, there is no slit. This can beseen from the careful comparison of the four drawings.

Although the preferred embodiments of the present invention have beendescribed above, the present invention is not limited to the abovespecific implementations. The above specific implementations are merelyillustrative but not limiting. Various forms can be made by thoseskilled in the art under the teaching of the present invention, withoutdeparting from the objective of the present invention and the scopedefined by the claims.

(1) The arrangement of the first bumps on the first outer boss and thesecond outer boss and the first recesses on the first inner flanges alsoplays the role of circumferentially positioning the first outer boss andthe second outer boss relative to the first inner flanges. That is,changing the positions of the bumps and the recesses on the outer bossesand the inner flanges plays the same role.

(2) In Embodiment 1 or Variant 1, the first bumps are positioning ribsarranged on the upper surfaces of the first inner flanges. Actually, thepositioning ribs may be replaced with one or more positioning columnswhich are arranged at the same positions as the first inner flanges. Inthis way, the positioning of the first outer bosses can be realized.

(3) In Embodiment 1, the first outer bosses are arranged in the radialdirection of the post. Actually, the first outer bosses can be arrangedeccentrically, that is, the center lines of the first outer bosses donot pass through the axis of the post. In this way, the same technicaleffects can be realized.

(4) In Embodiment 1, a pair of first outer bosses is provided, andcorrespondingly, two first grooves are provided on the first outerbosses. Two first ribs are provided on the two first inner flanges, andcorrespondingly, there are two upper positioning flanges and two firstupper and lower positioning flanges. Actually, there may be three firstouter bosses having an angle of 120° included between them. Similarly,there may be three first positioning ribs and three first lowerpositioning ribs, having an angle of 120° included between them.

(5) In Embodiment 1, four first outer bumps are provided on the outeredge of the outer slab. Actually, there may be three or five or anothernumber of first outer bumps, as long as the purpose of torque transferis realized. Even, the outer edge of the outer slab can be knurled ormanufactured in a shape of a corrugated handwheel.

(6) In Embodiment 1, the first outer bump on the outer side of the outerslab has a same thickness as the outer slab. Actually, the first outerbump may be replaced with a partially spherical bulge or a cylinderarranged in the radial direction of the post, so as to play a same roleas the first outer bump.

(7) In Embodiment 1, the first recess is a groove matched with the firstrib. Actually, if the first bump is a partially spherical bulge, thefirst recess may be a partially spherical pit or a cylindricallyrecessed pit. Or, if the first bump is a protruded cylinder, the firstrecess may be a cylindrically recessed pit.

(8) In Embodiment 1, both the upper surface of the first outer boss andthe lower surface of the second outer boss are slopes. Actually, it ispossible that only one of the two is a slope, and correspondingly, thefirst inner flange is wedge-shaped. In this way, both the axialpositioning and the radial positioning can be realized.

(9) In the drawings used in Embodiment 1, it is shown that the firstocclusion portions between the first outer boss and the second outerboss are communicated with both of them. Actually, the first occlusionportions may be arranged on only one of the first outer boss and thesecond outer boss, or directly arranged on the outer wall of the postwithout being communicated with both the first outer boss and the secondouter boss, as long as the first occlusion portions are high enough tooccluding the relative rotation of the first inner flanges. The specificheight of the first occlusion portions may be determined by thoseskilled in the art according to factors such as material and the outputtorque of the user, which will not be described here.

(10) In the drawings used in Embodiment 1, it is shown that an outerflange is arranged along the lower edge of the outer slab, and forms acomplete ring on the lower edge. Actually, the outer flange may bearranged in the middle or in the lower-middle part of the side of theouter slab. Or, the outer flange may be not a continuous and completering, and instead, it may be distributed in such a way that there is aflange in ¼ portion and there is no flange in another ¼ portion.

(11) Since the width of the first outer boss is not very large,actually, the width of the second inner flange and the width of thefirst gap may be designed to be ⅙ and ⅓ of the circumference of theinner wall at this height. Or, in Variant (4), both the width of thesecond inner flange and the width of the first gap are designed to be ⅙of the circumference of the inner wall at this height. The width of thethird inner flange in Embodiment 3 may be designed in a similar way.

(12) In Embodiments 4-6, the fastener passes through the first throughhole in the upper one of two three-hole bar members connected by a samefastener and the second through hole in the lower splicing piece.Actually, the fastener can also pass through the first through hole inthe lower splicing piece, because there is no structure for positioningprovided on the outer side of the post in this region. Therefore, inwhich through hole the lower splicing piece is passed by the fastener isnot limited by the type of the through hole. Furthermore, when it isunnecessary to circumferentially fix the upper splicing piece to thefastener, the fastener may also pass through its second through hole,and the relative rotation of the two is not influenced, as long as theupper splicing piece is axially limited, for example, by thecoordination of the connecting cap and the third outer boss.

(13) As described in Embodiment 7, the splicing of the robot is realizedby the fastener and the splicing pieces. Actually, the fastener and thesplicing pieces can be used for the splicing of building blocks or toys,or for the splicing of the training tools in classes, or for thesplicing of the simple mechanical motion models used in the researchcourses in scientific research institutions, or the like. They are notlimited to a single usage of splicing robots.

(14) As described in Embodiment 1, an upper positioning flange isprovided at the junction of the post and the outer slab. Actually, afence may be provided on the upper slab or an annular outer flange maybe provided on the lower surface of the outer circumferential surface ofthe post. All of these can play a role of radially positioning thefastener and the parts to be connected below the fastener.

(15) In Embodiment 9, the two connecting bars in the upper portion areconnected together by one connecting cap and two fasteners below theconnecting cap. Actually, the fastener can be used as a component, whichis above the middle fastener, for fixing the first bar member.

(16) In Embodiment 10, a first annular rib and a second annular rib areprovided to control different thickness of the third connecting hole andthe fourth connecting hole at their edges, so as to distinguish thefixed connection and hinged connection of the fastener. Actually, onlyone annular rib may be provided, without providing any annular rib inthe other connecting hole, with a very small difference in heightreserved between them. In this way, the same purpose can be realized.

All of these variants are within the protection scope of the presentinvention.

What is claimed is:
 1. A first fastener, comprising: a post; an outerboss; an outer slab; a first hole; and an inner flange, wherein: theouter boss is provided in an upper portion of the post; the outer slabperpendicular to the post is provided in a lower portion of the post;the first hole is provided within a local region of the outer slab belowthe post; the inner flange is provided on an inner wall of the firsthole; the inner flange has a first gap greater than a width of the outerboss; the upper surface of the inner flange is used for abutting on alower surface of an outer boss of a second fastener having a samestructure as the first fastener when limiting a position of connectedpieces in a height direction of the post; two sections of the innerflange and two sections of the first gap are provided on the inner wallof the first hole in a staggered manner; each section of the innerflange is equivalent to ¼ of a circumference of the inner wall of thefirst hole; each section of the first gap is equivalent to ¼ of thecircumference of the inner wall of the first hole; and when the firstfastener and the second fastener are connected together: a post of thesecond fastener extends into the first hole of the first fastener; theinner flange of the first fastener is fastened by an outer boss of thesecond fastener so that axial positions of the connected pieces arelimited and the connection of the connected pieces is realized; and theouter slab allows an enveloped shape of the connected pieces to beconical as a whole.
 2. The first fastener in claim 1, furthercomprising: a pair of the outer bosses; grooves; and ribs, wherein: thepair of the outer bosses may extend outward in a radial direction of thepost; the grooves are provided on lower surfaces of the pair of theouter bosses; and the ribs used for matching with grooves of the secondfastener are provided on the upper surface of the inner flange.
 3. Thefirst fastener in claim 2, further comprising a chamfer on two sideedges of the lower surface of each of the outer bosses, wherein the twoside edges are parallel to the radial direction of the post.
 4. Thefirst fastener in claim 1, further comprising a first lower positioningflange, wherein: the first lower positioning flange is provided on alower surface of the outer slab; the first lower positioning flange isused for realizing positioning of the first fastener and a connectedpiece located above the second fastener when the first fastener and thesecond fastener are connected to each other to connect a plurality ofconnected pieces; and the positioning realizes the coordination by anouter wall of the first lower positioning flange and connecting throughholes of the connected piece located above the second fastener.
 5. Thefirst fastener in claim 4, wherein the first lower positioning flangeextends downward from a lower surface of the inner flange.
 6. The firstfastener in claim 1, further comprising a positioning rib, wherein: thepositioning rib is provided on an outer side of the post; and an outersurface of the positioning rib coordinates with an inner surface of afirst lower positioning flange of the second fastener when the firstfastener is connected to the second fastener.
 7. The first fastener inclaim 1, further comprising a first limiting block, wherein the firstlimiting block used for limiting a relative rotation angle of the outerbosses relative to the inner flange is provided on the upper surface ofthe inner flange.
 8. The first fastener in claim 7, wherein a positionof the first limiting block is a position where a side face at a frontend of the outer bosses in a rotation direction is located when thegrooves exactly move to the ribs.
 9. The first fastener in claim 1,further comprising four first outer bumps used for accepting andtransferring to the outer slab a torque for allowing the first fastenerto rotate are further provided on an outside surface of the outer slab.10. The first fastener in claim 1, further comprising a firsttransmission through hole, wherein: the first transmission through holeis formed in a middle of the post; and the first transmission throughhole is used for allowing a piece to pass through the first transmissionthrough hole to drive the first fastener to rotate in acircumferentially relatively fixed manner.
 11. The first fastener inclaim 10, wherein the first transmission through hole has a cross-shapedcross section.
 12. The first fastener in claim 10, wherein the firsttransmission through hole has a square cross section.
 13. The firstfastener in claim 10, wherein the first transmission through hole has aregular triangle cross section.
 14. The first fastener in claim 10,wherein the first transmission through hole has an orthohexagonal crosssection.
 15. The first fastener in claim 1, wherein a center bar maypass through the first fastener and the second fastener to drive thefirst fastener and the second fastener to rotate together when the firstfaster and the second fastener are connected together.
 16. The firstfastener in claim 15, wherein: a first wheel and an arm for mounting thewheel are mounted with the first fastener; a second wheel and the armare mounted with the second fastener; and a long bar passes through thefirst fastener and the second fastener to realize synchronous rotationof the first wheel and the second wheel.
 17. The first fastener in claim1, further comprising a first outer boss and a second outer boss,wherein: the first outer boss is provided in the upper portion of thepost; the second outer boss is provided in the upper portion of thepost; the first outer boss is located under the second outer boss; andthe first outer boss and the second outer boss are located at differentpositions in a length direction of the post.
 18. The first fastener inclaim 17, wherein: an upper surface of the first outer boss and a lowersurface of the second outer boss are used for clamping a first innerflange on an inner wall of a first through hole of connected splicingpieces; and the outer slab, the first outer boss and the second outerboss are used for limiting positions of a plurality of the connectedsplicing pieces along the height direction of the post.
 19. The firstfastener in claim 18, wherein: at least one of the upper surface of thefirst outer boss and the lower surface of the second outer boss is aslope which forms an acute angle with an axis of the post; the firstouter boss and the second outer boss are oppositely provided in acircumferential direction of the post; and the first outer boss and thesecond outer boss are provided with a first bump or a first recessfacing each other.
 20. The first fastener in claim 19, wherein a grooveis provided on the upper surface of the first outer bosses; a groove isprovided on the lower surface of the second outer bosses; the grooveshave opposite positions; and the upper surface and lower surface of thefirst inner flange are provided with a rib matched with the grooves.